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Case Closure Summary Page 2 <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPM (Gas) 13,000 <1.0 4.92 <0.05 Xylenes 1100 <0.005 0.23 <0.0006 <br /> TPH (Diesel) NA 410 NA <0.05 Ethylbenzene 220 0.005 0.049 <0.0005 <br /> Benzene 160 <0.005 0.27 <0.0005 Oil &Grease NA NA NA NA <br /> Toluene 710 <0.005 <0.005 <0.0005 Heavy Metals 0.72 NA NA NA <br /> MTBE NA <0.005 NA <0.001 <br /> 1,2-DCA NA <0.005 0.54 <0.0005 <br /> Comments: Soil before results from tank excavation samples; soil after results from 07/14/00 confirmation borings. <br /> Water before results from MW-1, 07115188, except 1,2-DCA from 01126195. <br /> Water after results from MW-5, 08115107, except 1,2-DCA from MW-13 on 08/10110. <br /> IV. Closure <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land uses changes? YES <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 15 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN, REHS Title: DIRECTOR, ENVIRONMENTAL HEALTH DEPT. <br /> Signature: Date: 0 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 05/13/11 Response Date: 06/13/11 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRANCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />